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Kalsum, Leila
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RANCANG BANGUN DAN PENGUJIAN ALAT PRODUKSI BIOGAS DARI KOTORAN SAPI DENGAN VARIASI JUMLAH MIKROBA Kalsum, Leila
KINETIKA Vol. 9 No. 2 (2018): KINETIKA 01072018
Publisher : Politeknik Negeri Sriwijaya

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Abstract

Biogas is an alternative energy in the form of gas produced from organic materials. The biggest component of biogas is methane (CH4 , 54-80% volume) and carbon dioxide (20-45% volume) and a small amount of oxygen, H2 , N2 and H2S. The process of making biogas is carried out in fermentation, namely the process of forming methane gas under anaerobic conditions with the help of anaerobic bacteria in a digester so that methane (CH4 ) and carbon dioxide (CO2 ) gases are produced which are larger than hydrogen (H2 ), nitrogen (N2 ) and sulfide acid (H2S). This study aims to make biogas from organic waste materials and cow dung by conducting variations of microorganisms to see how much biogas is produced with a short span of time. The variation of Green Phoskko-7 (GP-7) microorganisms is 250 gr, 350 gr and 450 gr with a fixed composition and material concentration of 133 kg of cow dung: 66 liters of water (2: 1) which is fermented for 7 days with a fixed temperature 35ºC. The results of this study showed that the optimum amount was 450 grams of GP-7 with a volume of 0.338467 m3 and a methane level of 33.492 mol%
RANCANG BANGUN TRAY DRYER SISTEM HYBRID (SURYA-HEATER) UNTUK PENGERINGAN IKAN ASIN Yuliati, Selastia; Kalsum, Leila; Junaidi, Robert; HC, Fadarina; Azizah, Roro Rizqi Ramadhani; Utami, Winda Andea; Ningrum, Galuh Martiyah
KINETIKA Vol. 11 No. 2 (2020): KINETIKA 01072020
Publisher : Politeknik Negeri Sriwijaya

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Abstract

Drying process on salted fish is one of the factors that determine the quality of the products produced. Conventional drying has many weaknesses, namely fluctuating heat, poor hygiene and requires a large enough space and can affect product quality. One of alternatives in drying salted fish is using a hybrid system tray dryer with a solar energy source with additional electrical energy (heater). This study aimed to design a tray dryer with hybrid system (solar-heater), obtained the performanced of the dryer based on drying rate, heat transfer and heat efficiency of the hybrid system tray dryer (solar-heater), and obtained salted fish that met the water content standards based on SNI No. 01-2721- 2009. The treatments varied were drying time of 60 minutes, 120 minutes, 180 minutes, 240 minutes and 300 minutes and the variations of drying temperature of 60oC, 70oC and 80oC. The results showed that the optimum drying conditions were drying using temperature of 70oC with a drying time of 300 minutes, a moisture content of 31.2%, a drying rate of 0.1492 kg/hour m2, a conduction heat transfer rate is 52.01 J, a convection heat transfer rate is 71.15 J, a radiation heat transfer rate is 0.048 J and heat efficiency of 53.28%.
CO2 and H2S Absorption in Tofu Liquid Waste Biogas using Packed Bed Scrubber with Variation of MEA Concentration and Flow Rate Putra, Aan Ade; Kalsum, Leila; Hasan, Abu
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.204

Abstract

Biogas technology has become an alternative fuel that is often used in Indonesia. One of the raw materials for biogas that has the potential and is easy to obtain is waste from the tofu industry. Liquid waste still contains a lot of organic elements. The organic materials contained in the exhaust of the tofu industry are generally very high. The gases commonly found in tofu waste are nitrogen gas (N2), oxygen (O2), hydrogen sulfide (H2S), ammonia (NH3), carbon dioxide (CO2) and methane (CH4). These gases come from the decomposition of organic materials contained in wastewater. So that biogas produced from tofu liquid waste still contains CO2 and H2S gases which are quite high. Therefore, in this study the process of purification or refining of biogas products will be carried out using the absorption method through an absorber column using monoethanolamine (MEA) solution as a chemical absorbent through a 8 mm packed bed scrubber. The results showed that the best biogas flow rate in the purification process which produced the highest CH4 concentration of 95.12% was 40% MEA concentration and 0.8 L/min flow rate. The effect of MEA concentration on biogas purification causes the concentration of CO2 and H2S in the purified biogas to decrease as the MEA concentration increases. The best combination of 0.8 L/min biogas flow rate and 10 mm packing area reduces CO2 and H2S concentrations to 1.88% and 0 ppm.
Characterization of Rubber Bark (Hevea Brasiliensis) as s Raw Material and Fly Ash as a Catalyst for the Production of Biofuel Fenoldi, Nova; Muhammad Yerizam; Kalsum, Leila
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 4 No. 3 (2024): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v4i3.297

Abstract

The research conducted on the utilization of rubber wood bark biomass for biofuel production employs the pyrolysis process. Rubber wood bark, a by-product of rubber plantation waste, has the potential to be converted into energy. However, its utilization has not been optimal, often leading to accumulation issues due to its inability to be fully utilized. Therefore, this study aims to utilize rubber wood bark to produce biofuel. Fly ash catalyst is employed to expedite the biofuel production process. The testing methods used to analysis the characteristics of rubber wood bark include proximate analysis and calorific value analysis. Proximate analysis of rubber wood bark yielded the following values: moisture content of 6.39%, ash content of 4.61%, volatile matter of 71.41%, and fixed carbon of 17.59%. The calorific value of rubber wood bark was determined to be 4200.00 calories per gram. Meanwhile, the characteristics of coal fly ash used as a catalyst were analyzed using X-Ray Fluorescence (XRF) or X-ray diffraction. The analysis revealed the presence of silicon dioxide (SiO2) at 49.21%, aluminum oxide (Al2O3) at 16.22%, iron (III) oxide (Fe2O3) at 5.49%, calcium oxide (CaO) at 7.37%, magnesium oxide (MgO) at 1.72%, and potassium oxide (K2O) at 0.50%. The analysis of rubber wood bark and coal fly ash indicates that rubber wood bark can be used as a raw material for biofuel production, while coal fly ash can serve as a catalyst.
Potential of Activated Coal Fly Ash as an Adsorbent Material in Carbon Capture Technology Putri, Rizki Aria; Syarif, Aida; Kalsum, Leila
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 5 No. 2 (2025): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v5i2.379

Abstract

The rising carbon dioxide (CO₂) emissions from biomass combustion processes have become a central concern in climate change mitigation. This study explores the utilization of coal fly ash as a cost-effective and environmentally friendly adsorbent in carbon capture technology. Thermal activation was applied to fly ash at temperatures of 600°C, 700°C, and 800°C to enhance its surface characteristics. Characterization using Iodine Number and X-ray Diffraction (XRD) revealed significant improvements in adsorptive properties, particularly at 600°C. The findings confirm that activated fly ash possesses high potential as a CO₂ adsorbent due to the presence of crystalline calcium oxide (CaO), which facilitates carbonate formation. This research supports the integration of waste-based adsorbents in sustainable CO₂ mitigation strategies.
Co-Authors Abu Hasan AIDA SYARIF Azizah, Roro Rizqi Ramadhani Fenoldi, Nova HC, Fadarina Muhammad Yerizam Ningrum, Galuh Martiyah Putra, Aan Ade Putri, Rizki Aria Robert Junaidi Selastia Yuliati Utami, Winda Andea